What is CVE-2021-46147?

CVE-2021-46147 is a high-severity vulnerability in MediaWiki, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2022-01-10.

How severe is CVE-2021-46147?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in MediaWiki

CVE-2021-46147

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. MassEditRegex allows CSRF.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2022-01-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (42.8th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

MediaWiki

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

phabricator.wikimedia.org/T293341 (Third Party Advisory)
gerrit.wikimedia.org/r/q/I5980de35b0a01b5242b68b7b0bdc08adf5d968d8 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-46147?: CVE-2021-46147 is a high-severity vulnerability in MediaWiki, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2022-01-10.
How severe is CVE-2021-46147?: High severity. CVSS v3 base score is 8.8 out of 10.